Process of making swiss watch-bows.



c. 'w. HARMAN PROCESS OF MAKING SWISS WATCH BOWS.

APPLICATION FILED JAN. 26, 1911.

1,019,636. Patented Mar. 5, 1912.

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G. W. HARMAN.

PROCESS OF MAKING SWISS WATCH BOWS.

APPLICATION rum) 1111.26, 1911.

1,019,636. Patented Mar.'5,1912.

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UNITED sTA'r s rarENT OFFICE.

CHARLES W. HARMAN, OF NEW ROCHELLE, NEW YORK, ASSIGNOR TO JOSEPH FAH'YS& 00., OF NEW YORK, N. 'Y., A CORPORATION OF NEW YORK.

PROCESS OF MAKING SWISS WATCH-BOWS.

To all whom it may concern:

Be it known that I, CHARLES W. I-IARMAN, a citizen of the United States,and a resident of New Rochelle, county of Westchester, New York State,have invented certain new and useful Improvements in Processes of MakingSwiss Watch-Bows, of which the following is a full and clearspecification.

My invention relates to an improved process of making Swiss or Frenchwatch bows.

Numerous attempts have been made to produce from filled stock a Swiss orFrench watch case bow, that is to say one having a bow proper withtransverse bars at its ends forming axles or points of attachment to thependant, but due to the difficulty of preventing the appearance of theinner or base metal at the exposed surface, the attempts have met withlittle or no success, so that at the present time gold filled watchcases are commonly supplied with solid gold Swiss or French bows. If anyportion of the inner or base metal is exposed or acoessible to moisture,perspiration or other oxidizing or discoloring influence, the tarnishingor discoloration spreads over the precious metal so that the importanceof having the base metal entirely inclosed even at the inner ends of thebars which are set into the pendant is at once apparent.

The objects of my invention are to provide a process which is adapted tothe roduction of Swiss or French bows of filed stock, and further, toprovide an improved Swiss or French bow of filled stock.

The invention is illustrated in the accompanying drawings in which,

Figure 1 is an elevation of a iece of gold filled stock, one end beingbro en away to illustrate the inner or base metal with the outer shellor tube of precious metal. Fig. 2 is a similar view of the same with theears or nibs which are to form the outer ends of the bars struck up.Fig. 3 is a similar View of the same with the ends of the stock broughtinto alinement with the ears or nibs to give the preliminary form to thebars. Fig. 4: is an outside lan View of the same with the stock partialy bowed. Fig. 5 is an elevation with parts in sect-ion at the endsillustrating the drilling of the ends for the removal of a portion ofthe inner or base metal. Fig. 6 is a similar view Specification ofLetters Patent.

Application filed January 26, 1911.

Patented Mar. 5, 1912.

Serial No. 604,838.

with the stock completely bowed and the ends pointed to completelyinclose the inner or base metal and leave only precious metal exposed atthe inner ends of the bars. Fig. 7 is a detail view of one end of amodified form of bow in which the bar is shouldered at its inner end.Fig. 8 is an elevation with part in section of a die press at thecompletion of its descent for effecting the striking up or coaxing up ofthe cars 01' nibs which are to form the outer ends of the bars. Fig. 9is a plan view of one of the die plates, and Fig. 10 is an end view ofone of the slides hereinafter referred to.

Referring now more specifically to said drawings, 10 indicates a shellor tube of precious metal inclosing an inner or base metal 11.

The first operation in my improved process is to strike or coax up theears or nibs 12 near each end of the stock to form the outer ends of thebars 13. For effecting this operation I may employ the die pressillustrated in Figs. 8, 9 and 10. Referring to these figures, 14indicates one of the die plates of which two are provided each having agroove or recess 15 from which lead side recesses 16 which latter are toform the earsor nibs 12 above referred to. The two die plates 14 arecomplementary to each other and their recesses 15 and 16 together formthe shaping chamber for the first operation upon the stock. The dieplates 14 are suitably positioned and held together in a bed 17, and ineach side of the bed operates a slide member 18 which has a perforation19 for the reception of a push pin 20 adapted to register with andoperate in the recesses 15 of the die plates 14:. The slides 18 arenormally held outward by return springs 21 against an adjustable stop 22in position to be engaged by a plunger member 23, the under inclinedsurface of which engages in its descent a correspondingly inclinedsurface on the upper portion of the slides 18 so as to move theminwardly toward each other, thus bringing the push pins 20 against theends of the stock within the recess 15 and exerting such pressure uponthe stock as to crowd out into the side recesses 16, the metal which isto form the ears or nibs 12. After the ears or nibs 12 have been formedthe outer ends of the stock are bent downward into alinement therewithto give the preliminary form to the bars 13. The next operation is thento slightly how the stock into the general form shown in Fig. 4whereupon-the ends of the bars 13 are drilled at 24 to remove the inneror base metal 11 as shown in Fig. 5. Having removed a portion of thebase metal at the end of the bar, the bar may then be pointed and thebow shaped as illustrated in Fig. 6. It will be noted that the pointingof the bars effects the complete inclosure of the inner or base metal sothat the latter is not exposed at any point, and the entire outersurface of the bow and bars is of precious metal. The inner ends of thebars 13 may be given any desired shape as for instance that shown inFig. 6, or, if preferable, the shouldered form shown in the modificationFig. 7, which is obtained by first producing the form shown in Fig. 6and subsequently flattening out the conical ends into the shoulderedform. The apparatus necessary for effecting these several operations isfamiliar to those skilled in this art and hence is not specificallyshown and referred to herein. After shaping, the bow maybe polished orotherwise finished to suit it to the requirements of its particular use.

It is to be noted that while I have referred to certain specific stepsin my process each step may in itself comprise repeated or successiveoperations, the effect of which as a whole, is to bring about the changeindicated.

lVhat I claim is:

1. The process of making Swiss or French watch case bows which comprisesstriking up and bowing the stock to form the bow portion and preliminarybars, and subsequently contracting the precious metal at the inner endsof the bars to completely inclose the inner or base metal.

2. The processof making Swiss or French watch case bows which comprisesstriking base metal exposed in the ends of the bars and subsequentlydrawing together the precious metal of the shell of the filled stockover the exposed base metal at the ends of the bars to complete theinclosure of the base metal.

CHARLES W. HARMAN.

Witnesses M. G. CRAWFORD, OOTAVIUS KNIGHT.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C.

